On January 19, a 72-inch sewer pipeline known as the Potomac Interceptor collapsed near Cabin John in Montgomery County, Maryland. The pipeline, installed in the 1960s, carries up to 60 million gallons of wastewater daily from Virginia and Maryland suburbs to a DC treatment plant. Approximately 243–250 million gallons of untreated sewage flowed into the Potomac River, with roughly 194 million gallons released in the first five days. On January 24, DC Water installed a temporary bypass that largely redirected flow, though full repairs are expected to take 9–10 months.
On February 19, DC Mayor Bowser declared a local public emergency and sent a letter to President Trump requesting a Presidential Emergency Disaster Declaration and 100% federal reimbursement for cleanup costs. She also requested FEMA coordination, Army Corps of Engineers assessments, and potential SBA support for economic impacts.
A dispute over federal vs. local responsibility has emerged in parallel. Maryland Gov. Wes Moore contends the federal government has historically owned responsibility for the Potomac Interceptor, which sits on federal land, and that Trump's EPA declined to attend a two-hour legislative cleanup hearing. The White House, through press secretary Karoline Leavitt, blamed local Democratic leaders and pointed to Maryland's infrastructure grade. Trump demanded local officials act 'immediately' or ask him 'politely' for help.
University of Maryland researchers detected elevated E. coli, Staphylococcus aureus, and MRSA at the spill site. Drinking water systems, sourced upstream, are reported to be unaffected. FEMA's response capacity is currently constrained by a DHS funding impasse in Congress.